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Finding the Fourth Proportional to 2,891.68, 3,990.53 and 1,565.38

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Solution

The fourth proportional to 2,891.68, 3,990.53 and 1,565.38 is: 2,160.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.68 : 3,990.53 = 1,565.38 : x
  2. Step 2: Convert to fraction form
    2,891.68/3,990.53 = 1,565.38/x
  3. Step 3: Cross multiply
    2,891.68x = 3,990.53 × 1,565.38
  4. Step 4: Simplify right side
    2,891.68x = 6,246,688.02
  5. Step 5: Solve for x
    x = 6,246,688.02/2,891.68
  6. Step 6: Final answer
    x = 2,160.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.